Jackson TypeReference with dynamic method parameter type-CodePudding

I want to be able to create Jackson TypeReference with dynamic method parameter type with below example using reflection method.getParameterTypes()1.

Since TypeReference only takes compile type parameters but I read in SO you can do some trick to let it also to work with dynamic types.

 Method method = methodsMap.getOrDefault("createXXX".toLowerCase(), null);

    if(method != null && myBean!= null){           
        Object retval = method.invoke(myBean, mapper.convertValue(product , new TypeReference<method.getParameterTypes()[0]>(){}));
    }

where method.getParameterTypes()[0] is of type of java util generic list (the type erasure issue)

List<MyPojo>

CodePudding user response：

You should not use getParameterTypes at all. You should use getGenericParameterTypes, to get a Type instead. You can then pass that Type to a TypeFactory to get a JavaType, which convertValue also accepts.

Type parameterType = method.getGenericParameterTypes()[0];
method.invoke(myBean, mapper.convertValue(
        product, 
        mapper.getTypeFactory().constructType(parameterType)
    )
);